A researcher is conducting a study on contact lenses. She finds that in a sample of contact lens-wearing adults, those who wear their contact lenses for longer periods of time have more irritation in their eyes. Those who wear their contact lenses for only a few hours a day have less irritation. However, those who wear their contacts for longer times also tend to spend long hours at the office. As explanations for having more irritation in the eyes, the variables "length of time contacts are worn each day" and "length of time spent at the office per day" are O response variables. O independent O confounding O placebo 2. Interest rates for home mortgages have, in general, declined during recent months. With the apparent favorable influence for new-home building, there seems to be a clear relationship between x = the prevailing mortgage interest rates and y = the number of new houses being built per month in a Midwestern city over a period of 18 months. A scatterplot of the data collected shows that the linear model is appropriate. The equation of the least-squares regression line is Number of new houses = 672.89 - 30.65 x Interest rate and r2 0.49. Which of the following descriptions below best represents the value of the slope? O When no new houses are being built, the interest rate equals 30.65%. O When the number of new houses being built increases by 1, the interest rate is expected to drop by 0.3065. O When the interest rate increases by 1%, the number of new houses being built is expected to drop by 30.65. O We cannot interpret the slope because we cannot build a negative number of new houses.

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter4: Factors, Fractions, And Exponents

Section4.4: Least Common Multiple

Problem 64E

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Can you please help me on 21 and 22?

0.370
O 0.508
O None of these options are correct
21. A researcher is conducting a study on contact lenses. She finds that in a sample of contact lens-wearing adults, those who wear their contact lenses for longer periods of time have more irritation in their eves. Those
who wear their contact lenses for only a few hours a day have less irritation. However, those who wear their contacts for longer times also tend to spend long hours at the office. As explanations for having more
irritation in the eyes, the variables "length of time contacts are worn each day" and "length of time spent at the office per day" are
variables.
O response
O independent
O confounding
O placebo
22. Interest rates for home mortgages have, in general, declined during recent months. With the apparent favorable influence for new-home building, there seems to be a clear relationship between x = the prevailing
mortgage interest rates and y = the number of new houses being built per month in a Midwestern city over a period of 18 months. A scatterplot of the data collected shows that the linear model is appropriate. The
equation of the least-squares regression line is
Number of new houses = 672.89 - 30.65 x Interest rate and r2 = 0.49.
Which of the following descriptions below best represents the value of the slope?
O When no new houses are being built, the interest rate equals 30.65%.
O When the number of new houses being built increases by 1, the interest rate is expected to drop by 0.3065.
O When the interest rate increases by 1%, the number of new houses being built is expected to drop by 30.65.
O We cannot interpret the slope because we cannot build a negative number of new houses.
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Expert Solution

Confounding variable in a study examines the potential cause-and-effect relationship between dependent and independent variables.
Here, length of time contacts are worn each day and length of time spent at the office per day are confounding.

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